Plant Pathogens: Disease Concepts, Terms & Principles Quiz

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Questions and Answers

What did Robert Koch provide the 1st conclusive demonstration of in 1876?

The fungal causation of anthrax

The bacterial causation of anthrax (correct)

The viral causation of anthrax

The parasitic causation of anthrax

Which of the following is NOT one of Koch's postulates?

Inoculation of the pathogen from pure culture on a healthy plant must produce the same disease

Constant association of the pathogen with the disease

Reisolation

Isolation and growth of the pathogen in impure culture (correct)

In plant disease diagnosis, what does Koch's postulates help establish?

The symptoms of the disease

The casual relationship between a pathogen and a disease (correct)

The classification of plant diseases

The economic importance of the disease

Which term refers to the signs visible on a plant that indicate it is affected by a disease?

Symptoms Signup and view all the answers

What is the primary purpose of plant disease diagnosis?

To identify the causative agents of diseases Signup and view all the answers

Which term is used to describe rules of proof for pathogenicity, especially for diseases with unknown causes?

Koch's postulates Signup and view all the answers

What is the first step in Koch's postulates for proving the cause of a plant disease?

The suspected pathogen must always be present in the plant when the disease occurs. Signup and view all the answers

Which term refers to the external visible effects of a disease on a plant?

Symptom Signup and view all the answers

What is the second step in Koch's postulates for proving the cause of a plant disease?

The suspected pathogen must be isolated and grown in pure culture. Signup and view all the answers

Which of the following is a principle of plant pathology?

Disease triangle Signup and view all the answers

What is the fourth step in Koch's postulates for proving the cause of a plant disease?

The suspected pathogen must be reisolated in pure culture from the inoculated plant. Signup and view all the answers

What is the term used to describe the internal effects of a disease on a plant?

Sign Signup and view all the answers

What is the main focus of plant pathology?

Study of plant disease diagnosis Signup and view all the answers

Which term describes an organism that attacks only living tissues?

Obligate parasite Signup and view all the answers

Which concept involves the relationship between the host, the pathogen, and the environment?

Disease triangle Signup and view all the answers

What do Koch's postulates help in determining?

Pathogenicity of a microorganism Signup and view all the answers

Which term describes an organism that can become a parasite but is typically a saprophyte?

Facultative saprophyte Signup and view all the answers

Study Notes

Koch's Postulates and Plant Disease Diagnosis

Robert Koch provided the first conclusive demonstration of the bacterial cause of anthrax in 1876.
Koch's postulates are rules of proof for pathogenicity, especially for diseases with unknown causes.

Plant Disease Diagnosis

Koch's postulates help establish the cause of a plant disease.
The primary purpose of plant disease diagnosis is to accurately identify the cause of disease symptoms.

Key Terms

Symptoms refer to the internal effects of a disease on a plant.
Signs refer to the external visible effects of a disease on a plant.
A biotroph is an organism that attacks only living tissues.
A facultative saprophyte is an organism that can become a parasite but is typically a saprophyte.

Koch's Postulates

The first step in Koch's postulates is to isolate the pathogen from the diseased plant.
The second step is to grow the pathogen in pure culture.
The fourth step is to re-inoculate a healthy plant with the isolated pathogen to confirm its pathogenicity.

Plant Pathology

The main focus of plant pathology is the study of the causes and effects of plant diseases.
The concept of the "disease triangle" involves the relationship between the host, the pathogen, and the environment.

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Description

Test your knowledge on plant pathology principles, disease concepts, and terminology including the disease triangle, plant symptoms and signs, disease diagnosis, and Koch's postulates. Explore the economic importance of plant diseases and the classification of plant diseases.